Re: Skipping logical replication transactions on subscriber side

From: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
Cc: Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, "osumi(dot)takamichi(at)fujitsu(dot)com" <osumi(dot)takamichi(at)fujitsu(dot)com>, Alexey Lesovsky <lesovsky(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Skipping logical replication transactions on subscriber side
Date: 2021-12-17 11:13:11
Message-ID: CAD21AoCeE4Qyh8g8GeE-pd3YLazyVTF6VSojpgECCczsYiuuOQ@mail.gmail.com
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On Fri, Dec 17, 2021 at 7:12 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> On Fri, Dec 17, 2021 at 3:23 PM Peter Eisentraut
> <peter(dot)eisentraut(at)enterprisedb(dot)com> wrote:
> >
> > On 13.12.21 04:12, Greg Nancarrow wrote:
> > > (ii) "Setting -1 means to reset the transaction ID"
> > >
> > > Shouldn't it be explained what resetting actually does and when it can
> > > be, or is needed to be, done? Isn't it automatically reset?
> > > I notice that negative values (other than -1) seem to be regarded as
> > > valid - is that right?
> > > Also, what happens if this option is set multiple times? Does it just
> > > override and use the latest setting? (other option handling errors out
> > > with errorConflictingDefElem()).
> > > e.g. alter subscription sub skip (xid = 721, xid = 722);
> >
> > Let's not use magic numbers and instead use a syntax that is more
> > explicit, like SKIP (xid = NONE) or RESET SKIP or something like that.
> >
>
> +1 for using SKIP (xid = NONE) because otherwise first we need to
> introduce RESET syntax for this command.

Agreed. Thank you for the comment!

Regards,

--
Masahiko Sawada
EDB: https://www.enterprisedb.com/

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